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6ddd8d9166
There was a timing issue when subscribing to messages for topics. Old flow: - We generate JSON for topic - We subscribe to messages for topic New flow: - We keep track of last id in the topic message bus channel - We generate JSON - We subscribe to messages for topic starting at saved message id This ensures that there is complete overlap for message consumption and that there are no cases where an update may go missing due to timing
505 lines
14 KiB
Ruby
505 lines
14 KiB
Ruby
require_dependency 'guardian'
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require_dependency 'topic_query'
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require_dependency 'filter_best_posts'
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require_dependency 'gaps'
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class TopicView
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attr_reader :topic, :posts, :guardian, :filtered_posts, :chunk_size, :print, :message_bus_last_id
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attr_accessor :draft, :draft_key, :draft_sequence, :user_custom_fields, :post_custom_fields
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def self.slow_chunk_size
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10
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end
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def self.print_chunk_size
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1000
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end
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def self.chunk_size
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20
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end
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def self.default_post_custom_fields
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@default_post_custom_fields ||= ["action_code_who"]
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end
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def self.post_custom_fields_whitelisters
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@post_custom_fields_whitelisters ||= Set.new
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end
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def self.add_post_custom_fields_whitelister(&block)
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post_custom_fields_whitelisters << block
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end
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def self.whitelisted_post_custom_fields(user)
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wpcf = default_post_custom_fields + post_custom_fields_whitelisters.map { |w| w.call(user) }
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wpcf.flatten.uniq
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end
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def initialize(topic_id, user=nil, options={})
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@message_bus_last_id = MessageBus.last_id("/topic/#{topic_id}")
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@user = user
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@guardian = Guardian.new(@user)
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@topic = find_topic(topic_id)
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@print = options[:print].present?
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check_and_raise_exceptions
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options.each do |key, value|
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self.instance_variable_set("@#{key}".to_sym, value)
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end
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@page = 1 if (!@page || @page.zero?)
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@chunk_size = case
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when options[:slow_platform] then TopicView.slow_chunk_size
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when @print then TopicView.print_chunk_size
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else TopicView.chunk_size
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end
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@limit ||= @chunk_size
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setup_filtered_posts
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@initial_load = true
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@index_reverse = false
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filter_posts(options)
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if @posts
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added_fields = User.whitelisted_user_custom_fields(@guardian)
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if added_fields.present?
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@user_custom_fields = User.custom_fields_for_ids(@posts.map(&:user_id), added_fields)
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end
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end
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whitelisted_fields = TopicView.whitelisted_post_custom_fields(@user)
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if whitelisted_fields.present? && @posts
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@post_custom_fields = Post.custom_fields_for_ids(@posts.map(&:id), whitelisted_fields)
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end
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@draft_key = @topic.draft_key
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@draft_sequence = DraftSequence.current(@user, @draft_key)
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end
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def canonical_path
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path = relative_url
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path << if @post_number
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page = ((@post_number.to_i - 1) / @limit) + 1
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(page > 1) ? "?page=#{page}" : ""
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else
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(@page && @page.to_i > 1) ? "?page=#{@page}" : ""
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end
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path
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end
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def contains_gaps?
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@contains_gaps
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end
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def gaps
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return unless @contains_gaps
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Gaps.new(filtered_post_ids, unfiltered_posts.order(:sort_order).pluck(:id))
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end
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def last_post
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return nil if @posts.blank?
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@last_post ||= @posts.last
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end
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def prev_page
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if @page && @page > 1 && posts.length > 0
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@page - 1
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else
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nil
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end
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end
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def next_page
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@next_page ||= begin
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if last_post && (@topic.highest_post_number > last_post.post_number)
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@page + 1
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end
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end
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end
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def prev_page_path
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if prev_page > 1
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"#{relative_url}?page=#{prev_page}"
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else
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relative_url
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end
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end
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def next_page_path
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"#{relative_url}?page=#{next_page}"
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end
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def absolute_url
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"#{Discourse.base_url}#{relative_url}"
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end
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def relative_url
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"#{@topic.relative_url}#{@print ? '/print' : ''}"
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end
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def page_title
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title = @topic.title
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if SiteSetting.topic_page_title_includes_category
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if @topic.category_id != SiteSetting.uncategorized_category_id && @topic.category_id && @topic.category
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title += " - #{@topic.category.name}"
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elsif SiteSetting.tagging_enabled && @topic.tags.exists?
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title += " - #{@topic.tags.order('tags.topic_count DESC').first.name}"
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end
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end
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title
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end
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def title
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@topic.title
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end
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def desired_post
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return @desired_post if @desired_post.present?
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return nil if posts.blank?
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@desired_post = posts.detect {|p| p.post_number == @post_number.to_i}
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@desired_post ||= posts.first
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@desired_post
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end
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def summary
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return nil if desired_post.blank?
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# TODO, this is actually quite slow, should be cached in the post table
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excerpt = desired_post.excerpt(500, strip_links: true, text_entities: true)
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(excerpt || "").gsub(/\n/, ' ').strip
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end
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def read_time
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return nil if @post_number.present? && @post_number.to_i != 1 # only show for topic URLs
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(@topic.word_count/SiteSetting.read_time_word_count).floor if @topic.word_count
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end
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def like_count
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return nil if @post_number.present? && @post_number.to_i != 1 # only show for topic URLs
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@topic.like_count
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end
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def image_url
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if @post_number.present? && @post_number.to_i != 1 && @desired_post.present?
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if @desired_post.image_url.present?
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@desired_post.image_url
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elsif @desired_post.user
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# show poster avatar
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@desired_post.user.avatar_template_url.gsub("{size}", "200")
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end
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else
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@topic.image_url
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end
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end
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def filter_posts(opts = {})
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return filter_posts_near(opts[:post_number].to_i) if opts[:post_number].present?
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return filter_posts_by_ids(opts[:post_ids]) if opts[:post_ids].present?
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return filter_best(opts[:best], opts) if opts[:best].present?
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filter_posts_paged(@page)
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end
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def primary_group_names
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return @group_names if @group_names
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primary_group_ids = Set.new
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@posts.each do |p|
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primary_group_ids << p.user.primary_group_id if p.user.try(:primary_group_id)
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end
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result = {}
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unless primary_group_ids.empty?
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Group.where(id: primary_group_ids.to_a).pluck(:id, :name).each do |g|
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result[g[0]] = g[1]
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end
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end
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@group_names = result
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end
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# Find the sort order for a post in the topic
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def sort_order_for_post_number(post_number)
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posts = Post.where(topic_id: @topic.id, post_number: post_number).with_deleted
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posts = filter_post_types(posts)
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posts.select(:sort_order).first.try(:sort_order)
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end
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# Filter to all posts near a particular post number
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def filter_posts_near(post_number)
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min_idx, max_idx = get_minmax_ids(post_number)
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filter_posts_in_range(min_idx, max_idx)
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end
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def filter_posts_paged(page)
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page = [page, 1].max
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min = @limit * (page - 1)
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# Sometimes we don't care about the OP, for example when embedding comments
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min = 1 if min == 0 && @exclude_first
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max = (min + @limit) - 1
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filter_posts_in_range(min, max)
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end
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def filter_best(max, opts={})
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filter = FilterBestPosts.new(@topic, @filtered_posts, max, opts)
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@posts = filter.posts
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@filtered_posts = filter.filtered_posts
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end
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def read?(post_number)
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return true unless @user
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read_posts_set.include?(post_number)
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end
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def has_deleted?
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@predelete_filtered_posts.with_deleted
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.where("posts.deleted_at IS NOT NULL")
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.where("posts.post_number > 1")
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.exists?
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end
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def topic_user
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@topic_user ||= begin
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return nil if @user.blank?
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@topic.topic_users.find_by(user_id: @user.id)
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end
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end
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def post_counts_by_user
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@post_counts_by_user ||= Post.where(topic_id: @topic.id)
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.where("user_id IS NOT NULL")
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.group(:user_id)
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.order("count_all DESC")
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.limit(24)
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.count
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end
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def participants
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@participants ||= begin
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participants = {}
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User.where(id: post_counts_by_user.map {|k,v| k}).includes(:primary_group).each {|u| participants[u.id] = u}
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participants
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end
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end
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def all_post_actions
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@all_post_actions ||= PostAction.counts_for(@posts, @user)
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end
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def all_active_flags
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@all_active_flags ||= PostAction.active_flags_counts_for(@posts)
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end
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def links
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@links ||= TopicLink.topic_map(guardian, @topic.id)
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end
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def link_counts
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@link_counts ||= TopicLink.counts_for(guardian,@topic, posts)
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end
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# Are we the initial page load? If so, we can return extra information like
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# user post counts, etc.
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def initial_load?
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@initial_load
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end
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def suggested_topics
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@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic)
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end
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# This is pending a larger refactor, that allows custom orders
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# for now we need to look for the highest_post_number in the stream
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# the cache on topics is not correct if there are deleted posts at
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# the end of the stream (for mods), nor is it correct for filtered
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# streams
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def highest_post_number
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@highest_post_number ||= @filtered_posts.maximum(:post_number)
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end
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def recent_posts
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@filtered_posts.by_newest.with_user.first(25)
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end
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def current_post_ids
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@current_post_ids ||= if @posts.is_a?(Array)
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@posts.map {|p| p.id }
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else
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@posts.pluck(:post_number)
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end
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end
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# Returns an array of [id, post_number, days_ago] tuples. `days_ago` is there for the timeline
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# calculations.
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def filtered_post_stream
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@filtered_post_stream ||= @filtered_posts.order(:sort_order)
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.pluck(:id,
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:post_number,
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'EXTRACT(DAYS FROM CURRENT_TIMESTAMP - created_at)::INT AS days_ago')
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end
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def filtered_post_ids
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@filtered_post_ids ||= filtered_post_stream.map {|tuple| tuple[0]}
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end
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protected
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def read_posts_set
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@read_posts_set ||= begin
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result = Set.new
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return result unless @user.present?
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return result unless topic_user.present?
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post_numbers = PostTiming
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.where(topic_id: @topic.id, user_id: @user.id)
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.where(post_number: current_post_ids)
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.pluck(:post_number)
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post_numbers.each {|pn| result << pn}
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result
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end
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end
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private
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def filter_post_types(posts)
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visible_types = Topic.visible_post_types(@user)
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if @user.present?
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posts.where("posts.user_id = ? OR post_type IN (?)", @user.id, visible_types)
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else
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posts.where(post_type: visible_types)
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end
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end
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def filter_posts_by_ids(post_ids)
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# TODO: Sort might be off
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@posts = Post.where(id: post_ids, topic_id: @topic.id)
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.includes(:user, :reply_to_user, :incoming_email)
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.order('sort_order')
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@posts = filter_post_types(@posts)
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@posts = @posts.with_deleted if @guardian.can_see_deleted_posts?
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@posts
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end
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def filter_posts_in_range(min, max)
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post_count = (filtered_post_ids.length - 1)
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max = [max, post_count].min
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return @posts = [] if min > max
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min = [[min, max].min, 0].max
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@posts = filter_posts_by_ids(filtered_post_ids[min..max])
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@posts
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end
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def find_topic(topic_id)
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# with_deleted covered in #check_and_raise_exceptions
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finder = Topic.with_deleted.where(id: topic_id).includes(:category)
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finder.first
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end
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def unfiltered_posts
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result = filter_post_types(@topic.posts)
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result = result.with_deleted if @guardian.can_see_deleted_posts?
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result = result.where("user_id IS NOT NULL") if @exclude_deleted_users
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result = result.where(hidden: false) if @exclude_hidden
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result
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end
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def setup_filtered_posts
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# Certain filters might leave gaps between posts. If that's true, we can return a gap structure
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@contains_gaps = false
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@filtered_posts = unfiltered_posts
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# Filters
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if @filter == 'summary'
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@filtered_posts = @filtered_posts.summary(@topic.id)
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@contains_gaps = true
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end
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if @best.present?
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@filtered_posts = @filtered_posts.where('posts.post_type = ?', Post.types[:regular])
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@contains_gaps = true
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end
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# Username filters
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if @username_filters.present?
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usernames = @username_filters.map{|u| u.downcase}
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@filtered_posts = @filtered_posts.where('post_number = 1 OR posts.user_id IN (SELECT u.id FROM users u WHERE username_lower IN (?))', usernames)
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@contains_gaps = true
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end
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# Deleted
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# This should be last - don't want to tell the admin about deleted posts that clicking the button won't show
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# copy the filter for has_deleted? method
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@predelete_filtered_posts = @filtered_posts.spawn
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if @guardian.can_see_deleted_posts? && !@show_deleted && has_deleted?
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@filtered_posts = @filtered_posts.where("deleted_at IS NULL OR post_number = 1")
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@contains_gaps = true
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end
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end
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def check_and_raise_exceptions
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raise Discourse::NotFound if @topic.blank?
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# Special case: If the topic is private and the user isn't logged in, ask them
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# to log in!
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if @topic.present? && @topic.private_message? && @user.blank?
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raise Discourse::NotLoggedIn.new
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end
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raise Discourse::InvalidAccess.new("can't see #{@topic}", @topic) unless guardian.can_see?(@topic)
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end
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def get_minmax_ids(post_number)
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# Find the closest number we have
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closest_index = closest_post_to(post_number)
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return nil if closest_index.nil?
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# Make sure to get at least one post before, even with rounding
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posts_before = (@limit.to_f / 4).floor
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posts_before = 1 if posts_before.zero?
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min_idx = closest_index - posts_before
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min_idx = 0 if min_idx < 0
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max_idx = min_idx + (@limit - 1)
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# Get a full page even if at the end
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ensure_full_page(min_idx, max_idx)
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end
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def ensure_full_page(min, max)
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upper_limit = (filtered_post_ids.length - 1)
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if max >= upper_limit
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return (upper_limit - @limit) + 1, upper_limit
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else
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return min, max
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end
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end
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def closest_post_to(post_number)
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# happy path
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closest_post = @filtered_posts.where("post_number = ?", post_number).limit(1).pluck(:id)
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if closest_post.empty?
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# less happy path, missing post
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closest_post = @filtered_posts.order("@(post_number - #{post_number})").limit(1).pluck(:id)
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end
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return nil if closest_post.empty?
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filtered_post_ids.index(closest_post.first) || filtered_post_ids[0]
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end
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end
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